476 CYPERACEAE. * [Rhynchospora. 
to them, parallel to the axis, 2 compressed and keeled perigonial scales. 
Flowers hermaphrodite. Stamens 3 or fewer. Style 2- or 3- cleft, not 
swollen below, deciduous. Achene slightly compressed or obtu sely tri- 
gonous. — He ihe. usually coarse. Spikelets brown (resembling those of 
Scirpus), pedicellate in corymbose panicles, as in Rhynchospora. 
A small genus, tropical and subtropical, common to the New and Old World. 
1, H. dissitiflorum, Steudel, in Synops. Pl. Glum. II, 132. — «Stem 2—3 ft. 
high, triquetrous, scabrous in the upper half, foliaceous. Leaves broad- 
linear, with 3 promi inent nerves and many smaller ones, very Fs paehine 
‘ bro 
scabrous, elongate, forking toward the apex in two or three divisions, 
each bearing at its apex 1—3 ovate-oblong spikelets. Glumes 1-nerved, 
obtuse or shortly mucronate below the apex, pale rust-colored, glabrous. 
Perigonial scales free, with ciliate keel. Stamens 2. The lower flowers 
female, the upper hermaphrodite — Nearly related to H. latifolium, Rich.» 
ected 
Hawaiian Islands (Menzies es) according to Seeman in Fl. Vit. p. 317. — Colle 
also by d’Uryille in Ualan or Kusaie pone s Island). 
7. RHYNCHOSPORA, Vahl. 
Spikelets pei, Serotin: 1- or 2- (rarely 3-) flowered, the lower of the 
pind imbricate glumes empty, the uppermost usually with imperfect 
Ts. Hypogynous bristles 6, or sometimes more. Stamens 3 or fewer 
pata 2-cleft. Achene lenticular or globular, beaked with the persistent 
dilated base of the style. — Stems usually easly: Spikelets usually clus- 
tered, rich brown or rust- colored, in terminal or axillary heads or corymbs, 
sometimes forming large leafy panicles. 
About 150 species, —— over the warmer regions of the whole world. 
Leaves narrow, at most 1 “ broad ; achene brown, with pale Z 
A single contracted terminal corym . 38. R. spicaeformis. 
A terminal and one or several axillary _corymbs: 
sversely waved 1. > a 
filiform; achene obovate- oblong, Fogo ote lined 2. R. lavarum 
Seats 5~—10“ broad; achene straw-colored, wit h darker beak 4. R. thyrsoidea. 
1. R. laxa, R. Br. — Kunth, Enum. Pt. TT, 298: — Stems tufted, 1-2 ft. 
high, slender, obtusely triquetrous, distantly foliose. Leaves half as long 
broad 
te ann 
times folded, scaberulous on edges and keel. Spikelets ovoid, pointed, 
2—3” long, chestnut-brown, shortly pedicellate in cymose fascicles on 
the rays of axillary and terminal pedunculate corymbs (12—30 in each 
corymb); the few rays 2—6” long; the erect or appressed peduncles: 
‘/2—2', partly enclosed in the leaf-sheaths. Bracts and bracteoles filiform 
or subulate, not exceeding their rays or spikelets. Glumes 7—8, of @ 
